Nanocutting fluids are very popular due to their excellent thermo-physical and tribological properties which provide adequate cooling and lubrication during metal cutting. Conventional dry machining of difficult-to-cut superalloy Ti–6Al–4V faces several challenges. To overcome this, application of cutting fluid is indeed a necessity. However, performance of conventional minimum quantity lubrication (MQL) system, in which air–oil mist is sprayed into cutting zone, is somewhat limited due to inadequate penetration into tool–work and tool–chip interfacial regions, especially at high cutting speeds. MQL performance can further be enhanced by applying nanocutting fluid in which nano-sized additives are dispersed into the base cutting fluid; this is known as nanofluid MQL (NFMQL). In order to take care of several alarming issues related to environmental protection and occupational health hazards, the present study explores application feasibility of biodegradable Jatropha oil added with graphene nanoplatelets as nanocutting fluid. Machinability of Ti–6Al–4V is assessed under NFMQL; results are compared to that of dry and conventional MQL machining. Cutting force magnitude, tool-tip temperature, morphology of worn-out insert, chip’s macro/micro-morphology and surface roughness of the machined work part, etc., are studied in detail. For MQL and NFMQL, tool wear morphology detects existence of ‘unaffected zones’ which indicates sustenance of strong hydrodynamic tribo-film of cutting fluid, thus protecting the insert against wear. Up to 82 m/min cutting speed, NFMQL causes lower tool flank wear than dry and conventional MQL. On the other hand, superior machined surface finish is obtained under NFMQL up to 106 m/min cutting speed.

纳米切削液由于其出色的热物理和摩擦学特性而非常受欢迎，可在金属切削过程中提供足够的冷却和润滑。传统的干式加工难-到-切Ti-6Al-4V高温合金面临若干挑战。为了克服这个问题，确实需要使用切削液。但是，传统的最小量润滑（MQL）系统的性能受到一定程度的限制，在该系统中，空气油雾被喷入切削区域，这是由于无法充分渗透到工具-工件和工具-切屑的界面区域，特别是在高切削速度下。通过将纳米级添加剂分散在基础切削液中的纳米切削液可以进一步提高MQL性能。这被称为纳米流体MQL（NFMQL）。为了解决与环境保护和职业健康危害有关的几个令人震惊的问题，本研究探讨了可生物降解的麻风树油加石墨烯纳米片的应用可行性。作为纳米切削液。Ti-6Al-4V的可加工性通过NFMQL评估；将结果与干式和常规MQL加工的结果进行比较。详细研究了切削力大小，刀尖温度，磨损刀片的形貌，切屑的宏观/微观形貌以及加工工件的表面粗糙度等。对于MQL和NFMQL，刀具磨损形态会检测到“未受影响区域”的存在，这表明切削液具有强大的流体动力摩擦膜，从而保护了刀片免于磨损。NFMQL的切削速度高达82 m / min，与传统的MQL和干式MQL相比，可减少刀具侧面磨损。另一方面，在NFMQL下达到最高106 m / min的切削速度可获得卓越的加工表面光洁度。